Wow! Thank you for your feedback, I appreciate it.
The game's visuals are mostly sketches. Of course, the graphics will be redrawn in the future. Right now, I'm focusing on replayability, balance, and greater variety, such as adding new monsters and new types of human settlements (improving human AI). I agree with your comments, and in fact, some of them are already ready in the upcoming update, such as units in the grid, ranged units.
As for Starcraft, I am inspired by the gameplay of different units (Zerg, Terran), which makes Starcraft truly unique and interesting, at least for its time. However, I do not plan to take units and races from it as they are, as I still want to bring something of my own, something fantasy-like :) Besides, there may be copyright issues.
And thank you for the important comment that not everyone likes to play as a swarm of monsters. Adding a new race in the future could really expand the audience.
Cool, im a bit sad that you're going full fantasy but hopefully you'll make it work, i won't complain if its gritty and gory.
Also if you need inspiration i suggest looking at the tile and tower art design of the tower defense "Cursed treasure" i think it could give you some ideas to change the atmosphere of the game.