cave of trail 5 is realy hard, but possible. the tactic is not to kill the ultra-mob... you have to destroy the enemy castle befor yours is destroyed. i didnt got it yet, but i damaged the castle by 80%...
the easy mode is too hard and the difference between easy and hard is too small. at the moment 2/5, but work on, it looks like it can be a 4/5 game ;) great work
cant buy advanced towers after skilling tech-level. spend skill points disappears after leaving skill-shop. game is not bad, but need some more features like leaving a game, saving (does it save the game automaticly?), speed game up... 2/5