Great, makes a big difference. Also, I'd add, some particles to know when you're hitting the enemy successfully, or some kind of feedback. And maybe particles or colour variation for the spikes, so you know they're there to hurt you. Good fun still, enjoy this one.
Thanks for the extra feedback! I'll consider making those changes, or at least bear it in mind for my next project (there is a hit noise, but I think it's drowned out a little by the music and other SFX)