Very nice rage game, I struggled for awhile before I got the hang of it. It was alot of fun though.
I even went for a second play through to figure out what that other key in the 2nd lvl did but I couldn't figure it out, I thought maybe it had to do with that ledge you can drop down to on the decend to the final level but that wasn't it.
On my 2nd play through the key next to the door(The 2nd level with the clouds) wouldn't open the door up anymore and I had to double jump over it to get past, I'm not sure if that was because I was always picking up the first key as well.
Props to the funny twist ending and ridiculous credits sequence, had a blast. Nice work