Thanks a lot for the feedback, very usefull! Indeed many improvements need to be made to juice the game up, I haven't put too much effort on this yet, but the closer I get to the release the more I will focus on it.
The current version does bug and makes the game slower after a while, no idea why. But this doesn't occur in the most recent version of the game, so once I have finalized the next content update, I will upload a more stable version :)