I like your take on "you are the weapon", very cool idea.
The game overall was fun. I too found that spamming the spacebar led to me just dashing around the screen but this did not necessarily take away from the fun and made it more about getting as big of a combo as possible!
I enjoyed the game overall, I would be interested to see where you would take it beyond just slamming into things. I could see this being a very fun arcade game to play with a bit more fleshing out (I'll mirror other Mykaelos' sentiments about powerups)
Well done!