Good work on the retro vibe here, always nice to see. The player character feels nice to control as well, very smooth, and I like the details here, like the enemies flashing white when they take a hit is some good visual feedback. I noticed at times when I killed them though, I would boost right up into the roof. Not sure if this is intended, but it didnt seem that consistant to me, could be neat to have that happen every 3-4 kills though, so you can use the boosted jump to really progress through the level.