Fun game! It definitely has the potential to break, though (mechanically, not meaning a crash). I first beat the game at level 0, then went ahead and played on level 5. By the end of the game, I was gaining 55 coins per tile and my base damage was nearly 100 (I could've went further, but I was avoiding collecting coins at the end of the game so I didn't have to choose so many upgrades). Enemies spawned so much, that I had fully leveled my skills within the first half of the game and never needed swords ever again. Skills were: world, lottery, collect coins, double coins. Activate lottery -> double coins -> world -> collect coins to collect the full board, followed by two full boards of doubled coins, followed by one final board of normal coins. I feel like enemies may not scale quickly enough, maximum coin values should be capped at a certain point, or perhaps the required coins for improvements should scale over the course of the game. Regardless, I had a good time, thanks for making this! Edit: Oh, additionally, I feel like diagonal connections are way too strong without being behind an upgrade, but that could just be me.