I really liked the idea of this, quite creative and used in clever ways but enemies really felt like they were bogging down and otherwise great experience. having to kill the enemies felt like a really inconvenient way to get block. It was admittedly used well in a couple of circumstances, but overall it felt like a hinderance to the platforming because it was mostly just quite boring. Having a pickup or breakable block or something you could get that rewards you with blocks would've been a more fun mechanic (imo) that allowed it focus on the fun platforming over the mostly basic and easy shooting that ended up feeling time wasting if ever I died.
Other than that, the art and sfx are serviceable, if admittedly not great, but the music ended feeling very repetitive after a bit.
A good start, but it ended up not being great for me. Not bad by any stretch, but not great.