So much built in such a short amount of time, impressive! Had a lot of fun, and enjoyed the little details like the satisfying overlay when reaching a new level. Loved exploring the world too (the part where you climb the treetops was my favorite). Agree checkpoints would definitely help keep momentum going, maybe in between the big battles and the subsequent platforming areas.
"May be continued" - Loved that haha. I hope you do continue, you have a knack for world building :)