the idea is nice, but when you go back for selling the points restart and after a bit the game becomes a little monotone. i'm sure that with some updates, the game can be more interesting (like for example adding a background, since half of the screen is empty, and adding random events and fixing some bugs)
also another thing i've notice is the fact that with the limitation "Boss" the game doesn't enter well, it does for "On The Edge" tho