Hey I made a strategy game too!
Very cool tower defence! I love graphics music and overall game feel. Very smooth and pleasant.
Some feedback:
1. It's a bit tedious to navigate the map. I'd appreciate having a camera zoom by mouse scroll
2. Difficulty curve is descent for the first 5-7 minutes. But than as soon as I stabilised all attack directions, I could simply spam my forest around portals and knock them out one by one. That felt imbalanced, I would be glad to have more challenge
I really like this game and I would play it again!