What a great mini metroidvania! I had a blast playing it! It had some bugs here and there, momentum being kept on respawn after losing a life for example, but nothing major. Everything was telegraphed wonderfully, except one thing which was a bit frustrating. The fire ball attack of the boss doesn't seem to have any telegraph so a lot of times it suddenly hit me when I was attacking the boss. It's also pretty fast so when you get hit once you're likely to get hit again. Nevertheless, I was able to beat the boss!
Honestly, great game, the team did an amazing job! :)