Dude this demo was a blast :o !
I like how it starts a bit slow when you just wander around and then you fall in the hole and BAM the adventure starts accompanied by that awesome tune (seriously that bit crunched guitar is so awesome \m/ è_é ).
I was also not ready for that upgrade jingle and menu, this was so funny especially with the powerup descriptions.
If i had to nitpick i'd say the only small issue i had was a bit of confusion on where to go because i didn't expect the ability to climb stairs to require an upgrade but really this was quickly solved as soon as i got it, and my second issue was only that this demo was too short, it was really fun to play and i wanted more, but i totally understand it being short since well this is a jam ^^
So this is a quality entry, and i'm not surprised considering the quality of a past entry of yours i played in a previous jam,
so keep up the good work, cheers :)