Hi, thanks for the great review!
We are still working on the game and its balance. Some things will get easier, some things will get harder. Right now this is just a first look at how we see our game. We have a lot of different things in the pipeline, maybe even bringing in tower defence elements. And a lot of other things. A lot depends on the reaction of the players.
And thanks for the bug, I found it. It's fixed in the Steam store for now (it's already version 0.5.1 there). We will upload the fixed version here soon.