Sadly, this game isn't really worth your attention.

But let's start with the good stuff.

Graphics are really nice. While levels are mostly static, the background pictures rewards that fact with nice eye candy. Friendly and player characters also have a nice design - which can't be said about 2 colored enemies. These however usually either move around too fast, or die too soon to admire them.

Music is distinct and helps immerse the player in the world. That's all it does however.

Lore is quite decent as well, told either in comments to the story, spoken by characters in very neat waiting room between missions, and more thoroughly explained in written notes or descriptions we can unlock. Caveat is - the unlock uses the same currency as character upgrades, meaning most players will optimise their unlock order so that the lore exposition is dead last, making it a very weird decision to make by the devs...

Interestingly, the focus on masks and the map I unlocked at the end of the game remind me a lot of Bionicle, which admittedly is pretty cool. These ideas aren't really explored however, so it's just an observation of mine rather than a point for or against the game.

Now, for the bad stuff.

The main problem the game has is that the gameplay is tragically mediocre, shallow and in result - boring. For most of the time we stand in one spot, aim at opponents rushing us from 4 main directions (but generally from all directions) and use one special power chosen from several available. Sure, the game has opponents with differing attack patterns which you can defend yourself against and counter in one way or another, while juggling the entire horde rushing us, but the challenge isn't really fun. The player simply can't do enough things to have fun.

Alternative mode (fly mode) allows us to fly around in 2D area with only other difference being that we also get a dash skill, separate from special powers. This finally approaches other games where you can run around and at least kite enemies - but the mode is brought even lower by extremely badly placed camera. Our field of view is awful, and unadjustable.

Ok, the player can do very little. However, there's more. More enemies at the end of each wave that is. When enemies spawn, their purpose is simply to overwhelm the player. And throughout the entire playthrough, you will inevitably get drowned in enemies. No matter how skilled you are or if you grind up a bit of currency in alternate infinite challenge mode or which upgrades you chose, you will always get overwhelmed eventually. Not fun.
The only time that I really managed to perfectly defend myself was past the end of the game, when I unlocked all upgrades and best gear, and even then you need to choose where and when to shoot carefully. Still, by then I was obviously done with the game. That's just way too late.

Progression is also very slow. Since we often get overwhelmed, our point multiplier often gets reset, meaning that we stay poor for much longer. But even high scores don't bring much money, meaning that with 42 levels in first part of the story, from the very beginning to the final boss, we can gen an upgrade maybe every 2nd level at best. So not only do we get stronger slowly, the bad level design makes us feel even worse with interrupting our multipliers not by our own fault. And the upgrades all give +10% to singular stat on every step, so they're not even really felt or visible until we get at least 3 of them, aside from select few.

Story is very basic. Not bad on its own but considering other faults of the game it doesn't help.

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All in all, the game is shallow and not fun to play. Any kind of skill, strategy or even plain grinding are ineffective in face of badly designed difficulty curve. Progression moves at snail's pace and is at odds with unlocking other interesting stuff the game has to offer. And whatever good stuff the game has to offer, it's just not enough to outweigh the negatives...
Solid 2/5 game.
So yeah, just don't. Don't.

這遊戲勝過一堆收費遊戲的品質
更重要的是免費
但難度提升有點抖
快叫人一起連線遊玩

clearing out the backlog
this game actually has pretty good production value with well made artwork and music but I think the actual gameplay is dogwater