I think the game has potential. Unfortunately it wasn't explored too much. The building is free and there is no rules concerning it. So the best strategy is to randomly build as much as you can.
It would be interesting to introduce some resource that allows you to build. Then you would have to think where you want to put your platforms. Additionally you could create some mechanics that encourage you to build in a certain way. For example: power ups spawning on a map and you have to build a bridge to get to them. Or maybe the more resources you are hoarding, the stronger your gun is; so you can choose between building more and making it easier to dodge or build less and make it easier to kill things.
But I understand it's a jam game, so it's hard to even complete a game in that time. Anyway it's something to consider for the future