this was so fun! its a really creative and original game that you pulled off very well! the visuals are excellent and the progression in difficulty keeps a good curve to the gameplay, as with the enemies. they were pretty interesting to fight!
i was a little confused at first as to what bars meant what, and what the powerups did, so maybe tooltips explaining when you hover over them would help?? or just something in the description? also the trail upgrade confused me too until realised it only worked when clicking :P
aside from those points though, i had a lot of fun! the colour upgrades gave me incentive to replay it a few times. though i gotta ask, is there an end to the game?? and how many colours are there? :0