Needsalot of work but great start
It's fun for about 3 min. Then you get board however the mechanics are solid.
Suggestions: Sound, music and sound effects make a game
Color: Not just different weapons but different colors to make each peace unique
Upgrades: Perhaps have the figures change as they upgrade or there weapons change. Just something to help let you know who's been upgraded and who still needs.
Just a few Ideas. Great start.