I got to this point before the game was slowed to an absolute crawl, otherwise I'd definitely have kept going! (I'm using Firefox, if another browser might work better let me know!)
I feel like a large part of the game should be building barriers to create a maze with killboxes and things, which would be really fun. Unfortunately the first tier of wall (or sandbags?) seem to do nothing to impede the hordes, and I found that the higher tier walls are effective but cost too much to justify. Massing turrets along the back wall was the only way I found to survive the first wave, and the increase in budget after each wave all went to even more turrets as a result.
Really neat, though! If I could get the game to run better I'd love to see if I could try strategies using barriers.
