Game concept is nice and attractive, graphics too.
But the game misses some points (except monster glitches mentioned earlier).
Selling rooms doesn't return any money. And playing all game with the same amount of gold generation is awkward. Invaders get stronger, defenses - expensive, but we have to play with the same 15 gold/per time. You should add some perks for gold.
Decent but lots of bugs and needs fixing:
First off feels the tower/nest creatures and enemy ratio was a bit unbalance. The paladin and healers really spam the heals that makes it impossible to kill them once more waves come into the fray. Unless there is some anti-healing spell or creature in the arsenal, then fighting these guys en masse is just asking for a defeat. most of the critters like the poison spiders and skeletons only seem good as cannon fodder, the spiders more useful since they poison the enemies and spawn quickly, but they lack any other attribute to really kill off the enemies.
Second, there are some glitches were my monsters, like my dragon and beholder at a point, wouldn't move for anything. They just simply floated there and allow the enemy units to pass by unhindered at all. There were times when playing in Hard Mode that after winning, I do not get any of the stars I earned and have had to replay it again.
Third the pricing to upgrade your creatures is I guess in a word 'too pricy' you need to earn lots of stars and make a whole stratagem of what to use and distribute the points earn for future campaigns when some of the upgrades really require you to save up on a lot of stars (if that is possible) just for a possible upgrade that may or may not work at all.
Fourth is actually on the upgrades, maybe make those with the heighten cap or no need to spend money on spawning monsters passive or permanently active without having to buy it while in midst game. Especially if the monsters you summon are suddenly glitching and not doing their role.
Controls I felt were so so, there were times the spells that would be picked and dragged to the field would suddenly float there and not activate unless clicked again. When moving the move, there was lag response from the keyboard and certain times when mouse clicking the board doesn't respond (noticed it was when I click the black areas of the maps).
The story itself was humorous, at least as far as I manage to go before I was ridiculously overwhelmed by the disadvantages I was put it; and no refuse to play on easy mode, that takes away from the challenges of knowing how hard a game can be.
Game Mechanics: Needs improvements and clearing of bugs
Good show, and hope this helps.
I liked the graphics and the concept but it seemed like it was missing something and sometimes it didn't make sense how it played. I had difficulty understanding why some enemies could just walk right through my guys. Other times I just got tired of having to constantly click to spawn my guys which really slowed the game down because it can be difficult to be timely in fast forward mode.
I had no idea how the upgrades worked but once I found out, I realized I spent them all accidentally then on top of that the reset stats button didn't work. This really frustrated me and I didn't bother to play again after that.
v 1.21 is still has lots of bugs.
When I'm playing Hard mode, I save my money to buy some dragons, after some time they are just frozen there doing nothing while de heroes steal my tresure chests.
Please consider beta testing your game before you release, this could be an awesome game, if wasn't for so many bugs in so many versions of the game.
"furthermore he rising rate will be increased"