I figured out a cheesy strategy by wave 7 where you just dash to the roof 4-5 times then kill all the enemies that were pooling on the floor, hit the obelisk, and repeat.
In my floor dashing era (waves 1-6), I really liked how the dash had weaknesses in its downtime which added lots of mastery in timing instead of holding that I had to figure out. If you make sliding right before a hit one-shot the red guys, that would've been awesome, but like your first comment, I understand time constraint stuff.
Overall it's really fun for the first 5-10 minutes, you succeeded at that, and I really shouldn't rate lower because there's not much more content, it's a game jam after all. Sorry if I'm being too critical.
Also I really like the slamming into obelisk sound effect + bounciness did you hardcode the bounciness or did it just happen?