ITS YOYO TIME, HAHAHAH. The different voice lines at the end of the level made me laugh every single time. I also love the name "Oyoy." This was an absolute blast to play. The mechanic is super unique, and the yoyo feels super satisfying. It really reminds me of the yoyo in Terraria, which I absolutely love.
The only "negative" I noticed was that there's sometimes a small lag when killing an enemy.
Besides that, this is overall an awesome start for a full game, if you plan to expand on it.
Good job, guys!