This game looks amazing, I love the color scheme. The monsters honestly are adorable(not sure if that's the vibe you wanted but they are very cute)and the boss was so cool to see moving towards me. I love the concept of this game as well.
The only negative I encountered was that I had no way of seeing how much currency I have at my disposal.
The process of building the towers and upgrading felt intuitive and the large circle helps with the range. I would suggest to have a double click system when purchasing or upgrading the towers, although the text boxes may clog the playing field.
I understood the mechanics after a few refreshes. A small tutorial of the controls and the overall objective would be greatly appreciated. I like the red stripe on the side of the screen where the monsters will appear. I was confused on how to add further towers, for some reason, I was not able to access the medical tower and any options under the word medical. I would chalk that up to user error, it may be me, it could help to add a small scroller bar on the side. Or perhaps make it a pop-out menu.
The first ten rounds are paced very well. I found that the rounds moved in a good fast pace. I made it level 14, but I'm not sure what eventually caused my demise. I would enjoy if there was a small indication on how to start the game, a small tag saying to place a tower to begin.
The towers is really where I found my strategy. I was able to determine exactly where a tower should go based on what it targets. I also enjoy having the "slums" as a sort of barrier around my city. I very much enjoyed the variety of towers.
Overall, I found no bugs and no issues with lagging. I was able to entre my name with my high score and ended the game.
A fantastic game! I would love to play this more often, it moves fast and you have to make quick decisions.