Kind of cool to see a new Manic Miner-like game. I loved the original to pieces, and keep waiting for a worthy remake or update of it.
You set the pay gate after only two levels, and by that point I wasn't convinced the game's quality warranted any sort of money.
The art would look sloppy even in a free GameMaker game.
The music is grating and out of place as are the sound effects.
The dude's movement is far less precise than that of Willy Miner.
The two screens you include in the demo are pretty sloppily designed and lack the clever flow of the screens from the original.