Several problems with this game. One, ally targeting. Two, spear throwers on challenge stages. Three, the final boss *really* needs a limit on the number of adds it can summon. I killed over four hundred and still ended up being drowned by them, with all upgrades and a full set of runes. The boss has far too much health for the amount of adds it spawns, and it summons them far too often from mid-health downward. Not only that, but it seems like the adds get stronger as the fight goes on, effectively making it impossible to win after about the two minute mark.
To do level 39 you really need to give us some kind of reset and/or pause keybind. Especially for bonus mode. The absolutely perfect timing required for this one level throws the entire game off for me. Speaking as someone with rheumatoid arthritis, this level is simply impossible to beat without 'cheating' by right-clicking to pause the game between clicks (and only barely possible then).
I'm noticing significant lag between when I click a tower/item/spell and when the action actually registers. This tends to be a problem when I'm trying to drop a second meteor on a boss who's halfway to my gems, and end up dropping it halfway across the map because I don't believe the click on the spell registered.
I've noticed, when in a particularly frenzied clicking/keysmashing storm, the Blink Shift skill will self-activate sometimes when I try to use Soul Tempest (and no, I'm not hitting the Shift key accidentally). I don't know if this is lag-related or what, but it can be extremely inconvenient when, for example, I'm at one end of a pack of ninja and try to Soul Tempest them only to end up right in the middle of a storm of shuriken.
It would be nice if half the training sessions weren't purely based on luck. Specifically the drop segment for speed and the ladder climbing for climbing, but especially the latter (I don't know if there are worse offenders, as I've only made it to the ice level so far). It would be nice if your stats made a difference in the training sessions as well.
Three machine guns per floor will get you through round 9, and swapping one out for a laser will get you through round 10 and 11 without even having to click. End of round 11, swap out another set of guns for lasers. The only rounds you should need to click-fire on are 1 through 3, everything else your guns should be able to handle. Buy elevators as they become available. The start of day 14 you should be able to afford three lasers in every elevator, at which point all you really need to do is sit back and watch the explosions.
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 "Red Remover"){kind=icon}
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That's probably evasion skill. I'll try to keep the kawari optional and rework the skill.