I'm super glad you like it!
Thank you for the feedback and those great ideas!
1- You are right, it is cumbersome :/, I will think about adding scroll wheel input for changing colors
2- That is really interesting! Maybe change the color value a bit when losing health :D
3- I tried, for the SFX, there were way too many sounds on the final stages with so many enemies, so many projectiles that the sound just breaks, I tried a lot of different configurations and approaches for the sounds, but it just kept breaking. For the VFX, there are actually particles when enemies dies in the downloadable version, WebGL couldn't keep up with the VFX, so I had to remove them for the final browser build.
4- That is a really cool idea, yes!
5- And that is also another really cool idea!
Thank you for all your feedback! Really appreciate it!