Very cool and underrated strategy game here. I played quite a lot of strategy games and I can really feel your base game mechanics are quite well-considered - players can somewhat control a group of enemies to crush them into themselves while avoiding them moving to the towers.
Generally, the UX is OK, the direction of enemy movement can be foreseen through the tab key and players can know what will be the next face value after they press WASD. The only complaint is that the "buying structure" options don't seem clear to me because there is no feedback when I select a structure to buy, initially I don't know whether I need to press/drag the icon or some other gestures. But overall it is good. I suggest you add "You need to click on the building icon/desc and then click on the valid space on the board to build." to your game's page.
A minor bug: I can literally use "Push" infinitely with no cost and push enemies into oblivion.
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