Game becomes a bit too boring at 15+ levels. Battles are both too long and too easy, so needs either more challenge or more drive. Also item drop rates are annoying, stopped scrolling through tons of stuff after certain moment. But well done, nevertheless.
Good idea and well done, but almost no challenge closer to endgame - last 5 or 6 missions are boring, considering you are a killing machine with all the upgrades and weapons. 5/5 anyway.
P.S: Didn't get "Explorer" achievement. Maybe it needs clearer description?
Thank you. :) I'm happy you found this game here on Kongregate!