Pros:
1) PC: Works on Win-10
2) Graphics pretty good
3) Enjoyable Tower Defense
4) You get 3 profiles (I assume that 3 people can play the same game on the same PC if desired)
5) Small SW install size, playable on a "toaster" (low end PC) Don't need an NVIDIA 4090 :p
------ Remember, this was released in 2015.
6) Got it on sale, so it was a GREAT value in the Steam Store

Cons:
1) In-game Clicking: To pick up coins and resources to build towers
------ This is like a mobile game, and I just don't like it. I prefer "turn based" games where you get stages to upgrade towers.
2) Tutorial: It's ok, but it doesn't describe all aspects of the game (upgrades, etc).
------ I used YouTube videos to help with understanding the game a bit better.
3) Plot: A bit thin (and this isn't a big negative)
------ I bought this for the Tower Defense, not the plot, so this is a VERY MINOR negative.
4) Quit (on button labels)
------ This may be an English translation issue. The word "Quit" is used in the place of "Back" at times.
------ You may want to halt the game and restart. You hit "Quit" (which is true) but you just go back to the prior screen (so you can start again). I guess that it simplifies the game to use the same word in various places, I don't know.
5) Screen/View: (out of visible area at times)
------ There are several battles where the "money" towers are out of view. You need to "click the coins" to get the money to upgrade your tower, BUT, the battle is on the top of the screen, where you need to click for "gold coins" (which you use for non-tower boosts (brick walls, mines, sat laser beam, etc). There should be a way to size the whole map so it "fits" on your monitor, versus needless scrolling. This is just more "busy work" like clicking coins. It can be annoying. Maybe this similar to Con #2 (mobile style game play).

A rather simple game that is clearly meant for cellphones

It's hard to find a good cup of coffee for less than 2 dollars these days. I paid less than 2 dollars for this game and have had one of the most fun tower defense experiences. Proves once again, its not about the graphics, its about the gameplay and fun, and this game has it in spades. There are a lot of real time trade offs you have to make every level and every wave, which makes this a great tactical challenge. You will lose often, but less than perfect wave completion still gets you progress towards macro unlocks you can choose from. All around, a great investment of your $2