Wow, this is really awesome! The graphics are simple, but work well. The audio is coherent a feels good. The game feels well polished and reminds me of...mega man 2! The getting rid of upgrades is a cool idea and well implemented here. Got rid of the wall jump, then charge shot, then dash.
There were a few times where I got stuck trying to jump while standing above a ladder. I also found the game pretty difficult (maybe due to a lack of healing?).
Great job!