This game has a lot of potential, really cool idea!
The build mechanic works well, although the girders are sometimes placed at the wrong place. Certain parts should be more durable than others I think, especially the chainsaw (which needs to deal more damage, right now it feels like any other trash object). Regarding the movement: It already works quite well for a jam game, but I think you should add more control to the jumping mechanic (primarily direction).



