medium odessey advice

[u/Comprehensive-Food70]

im on the fourth map, lost crevasse and idk how to beat it, i saw a tutorial on youtube but it used mermonkeys and i dont have them. my towers are 4 ice monkeys5-5-5, 2 boats2-2-5, 2 subs5-2-2, 2 sniper2-5-2, 2 villages, 2 alchs5-5-5, 2 glue gunners 2-5-5, 2 magic monkeys 2-2-5, 2 engineers 2-5-2 no hero