That sounds really cool. I gave all the abilities upfront... but adding some new ones and making t more progressive like a metroidvania is really fun too. Thanks for sharing the link, I'm really curious to see how yours turned out too. and see what cool ideas you came up with!
ps: I uploaded a downloadable windows version so you can try in fullscreen if you like. As for the big dudes, you can double jump over them and escape... just a little tricky have to reach maximum height on the double jump and get the timing right :) No need to kill all the oni to get the level keys