That was absolutely frantic and quite fun. I could see this working really well if you slowed it down a little and gave the player different bridge pieces (like a straight piece, corner, T-junction) so that you have to think about how to build a way forward while panicking. The gaps could have obstacles like rocks that you have to build around.
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the idea of different bridge pieces sounds like a fun idea, would it be similar to the special plants vs zombies rounds where give you random plants to place, but in this case bridges? there are some T-junction pieces in the tileset if you look closely btw. The idea of rocks in the way would 100% be a good addition if I improve the game.