I think this is a very nice game in the making. I enjoy building up the world by means of a "skill tree".
It crashes when I click "exit", let me know if you need the details of the error.
It's smart how each shop item combines a usefullness for the player, with an enrichment of the world (some add to the scenery such as bushes, some add difficulty such as enemies, etc). I think this is cleverly done.