I love Battle Slugs! The cartoony graphics are cute and funny, and the backgrounds are interesting and detailed. The game is challenging - there are 25 playing fields, and three different levels of play (Easy, Medium, Hard) against the AI. It's a challenging strategy game - I just finished the entire Easy mode and unlocked all 25 playing fields, and it was tough. However, I didn't claim 3/3 stars on all the boards, so I'm definitely going back to it, before trying out the Medium/Hard modes. Best of all? There's also a Multiplayer mode.
This is definitely a game with replay value, but I have a couple complaints: 1) If I quit mid-game, my progress isn't saved. 2) Loading times are way too slow for an otherwise polished app. Sometimes I make a bad move, and I'd like to restart the board instead of Surrendering, and then having to go through two slow loading pages before I can relaunch the board.