The devs are smart in a snakey way. The game takes almost exactly 5 hours for you to realize how little there is here. You can reach the final boss in about 3-4 hours. You'll fight it, get absolutely smacked and realize you need to re-spec in a single tower to even think of beating it, and then it clicks; this entire game can be done using a single tower, investing only in that tower, and is only a few hours long.
I'm going to go a little in-depth on the final boss, just know you wont like it. It isn't respectful of the game design or your time, and is largely RNG based as to whether or not you can beat it.
To start, this game has 3 towers total. One cannot hit the final boss whatsoever, one is supposed to be a healer and has piss-poor damage even when capped out in upgrades, and the other's primary damage type cannot hit the final boss. This forces you to build entirely for % chance to poison and burn on archers, and to spec just for that in the skill tree. Not too bad, right? Well, you also have to get lucky enough during your run (the rounds that lead up to the boss) to get items that support this build, and you need enough for 10-15 of these builds.
Next up, a core mechanic of the game is being able to pick up and move towers; you cannot do this on the final level. Why is this a problem you ask? The boss paths differently as it loops the map, meaning you need to be able to move your archers to account for his pathing, or else they will just stand there uselessly (which they do, since you can't move them this level).
Finally, the last boss doesn't even fight back. It just flies around with a massive health pool, amused that 90% of your towers can't hit it, and the towers that can hit it can't deal direct damage, and that your % procs aren't proccing, and that the procs that ARE hitting it aren't doing enough damage despite the entire skill tree being maxed-out, and that only SOME of your towers got the proper build even needed to damage it properly. After all this taunting, it then silently flies into your orange tree and ends the game. No attacks. No lines. Just a circle around the map into a game over. Innovative, right?
Just to summarize. The devs made a game that takes right around until the refund mark to reach the final level (which you don't know is the final level, mind you), and made the final fight ignore 90% of introduced mechanics, 70% of the skill tree, 2/3 of the towers, 90% of means to do damage, while being half RNG based to beat, while not doing anything but moving in a circle with a massive health pool, all because it will push you JUUUSTT past the refund window to complete.
