Very great game! I'm surprised you we're able to add so much content in such little time. Only issue I had was with wonky hitboxes (not sure why I was getting hit sometimes, other times I definitely should have been hit but wasn't). Other than that, it's truly an amazing game :)
I really love the artstyle! Very nice palette you chose. Also, solid gameplay. I like that you could charge up your shots to make them more powerful. Nicely Done!
Very strange that it ran badly for you... I will admit that the code in this game wasn't thought out 100% well and may possibly have some sort of memory leak or something similar. Not sure why it seems to only affect you though, sorry about that
I did draw all the sprites myself :D Also, thanks for the ideas for a future version! I am currently working on one but was struggling to come up with new mechanics, I think I'll use your suggestions!