Sailed right past the 32-bit integer limit and had a blast doing it! :D
Really, great job designing this game. It's so fun to play, I forgot to do my chores all day.
It's not without its faults however. For one, with my upgrades I couldn't find a way to end the game, unless I intentionally played badly.
The multipliers seemed to be all over the place - the same move (placing green over green, while the entire tank is filled with green) sometimes scored 30x, sometimes 100x+. I couldn't find out why and when that happens, but it seems some of the upgrades don't activate all the time - is this intentional? For example, I (unwisely) chose cyan solvent, and sometimes it changed single-tile cyans into another color, sometimes it didn't. Same with the multiplier bonuses - it seems not all of them get triggered every time, hence the varying multipliers.
I also were wishing for more space all the time. I got excited when I got the +1 tile upgrade, but never got another one. This resulted in 4-straight pieces spawning, with only one valid placement in the entire tank. Maybe getting upgrades until you have 4x4 tank would be nice.
Please keep working on this game, it has such huge potential to be even more amazing! Also consider an android version. Would love to pass the time with this thing.
