Got to the endgame. Gizmos and Magic are a severe bottleneck for kiln, terrace, and flamethrowers. Got to wave 24 on TD and there were so many units, it crashed and wiped my save.
The idea of having 3 games run concurrently is a neat idea, but it gets very slow for a browser game. Farming king crabs takes forever, there's sometimes 10+ minutes between buildings, and the tower defense units costing gizmos means you're trying a round maybe once an hour. There's a lot of waiting that just doesn't make sense for what this is.
The chime for when units are ready to build chimed when I toggled the button, but not when the unit was ready.
Since my save was wiped and I didn't export it (I didn't expect the crash), I don't have anything to show for it, and I can't test further updates without serious time commitment. Good luck on future builds.