cool little game! I like the different enemy types. Once I figured out I could just increase the fire rate and hold down the LMB, it was pretty easy. the mechanic is cool, I just think it needs a bit of polish to make it more fun (power ups or even limitations you could accidentally collect if you don't shoot them would be cool!) Personally, I don't think it fits the theme because LMB can be used to control multiple things on screen (which it does in this case) and in a way takes away from the restriction of the theme. I see where you were coming from using sliders and not buttons, but that's just my personal take on the theme. Overall, good work!
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Yeah this was actually the third idea I worked on for this jam. The other two I had scrapped. Those two were both true one button games, but they weren’t that much fun to play. I wanted to be more innovative and creative opposed to just making a one button game. I have updated the game now. Shooting the hearts will cause you to lose health too. I made a variable spawn rate so now every 20 seconds, the enemies spawn rate increases too. I might add some power ups too like different projectiles or using two guns and etc. The update will be out after the jam ends unfortunately.