Hey, cool concept. Stumbled upon this while I was researching some stuff for my SHMUP project.
The background visuals match the trance music really nicely (I'm a sucker for shmups that use trance/dnb soundtrack btw), also for a while I thought the player shooting sound is the songs percussion lol (maybe that was intentional??).
Anyway dunno if you're still working on this, but as some feedback I'll say the teleport should have a cooldown/use some resource, maybe tie it into the gameplay/scoring a little bit like doing a bullet cancel at the place where you're teleporting from or something.