I really like this game, probably my favorite I've played this jam! The graphics are nice, the music is good (although the loop is a little short), and the gameplay has a pretty solid concept. Your health and ammo being one shared resource is neat, and the basic gameplay of launching coins up and recollecting them is both intuitive and fun. I just wish there was more of a purpose-- it could be anything, trying to reach the end of the level, or just going for highscores. As it is right now, it feels kinda aimless. Oh, and minor nitpick, but when you scale up pixel art, try to do it at 200%, 300%, or some other multiple of 100. If you do, as an example, 150%, half the pixels will be regular size, and half will be 200% scale, which can be kinda jarring. I'm only bringing this up because the game is really good, and I think the little improvements like that could be a big help, I think!
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Thank you for you appreciate and suggestion! I'm still update the game by far, my idea making a kind of climbing-tower game, you can buy update use your coin(life). I was already design 7 type of enemys and one level, the game goal is to beat the level and meet the final boss. I don't know how to fix the pixel-perfect scale problem on the web edition, on my desktop edition it is *1/*2/*3 or full screen scale. I don't know how to achieve this in the itch internal game browser(seems it's fix size) so maybe I'll optimize for the web edition manually.