nice first game. a few suggestions to your next attempt (and you should make another one, regardless of what others here are saying.) you can simplify a good deal of this game with some easy fixes.
1) there is no need for a zoom out button, simply use a fixed distance, the distance you want the player to have.
2) you dont need to have a tab to show what the health of the walls are, simply put that information on the wall itself, you could even have the walls go from green to yellow to red like your graph does.
3) clearly label what each vendor item is used for (alot of issues w/ chaingun only hitting air, maybe make it a missile launcher instead?)
4) indicate what a player will be expected to face on the next day, so that they can better prepare their fortress for the upcoming battle.
i hope you found these comments to be useful, keep up the good work!
point and click adventure game for beginners. not bad, not great either, tedium on the repetitive "find the object that looks like this" portions. overall, my patience was strained more than my brain. 3/5