Nothing special, though playable
The upgrade scheme for this game is vaguely interesting, but there is little motivation for a build other than the simple: "Make one tower and upgrade it as much as possible" technique. The fact that enemies somewhat ignore the path makes mine placement a potentially unreliable technique.
Mouse aim would probably be appreciated if it could be enabled and disabled mid-game.
Mines are probably over-powered in later levels, but for the fact that they often become glitchy if abused. Being able to click on a tower to determine its stats would be helpful (e.g. how many upgrades, how many elements, etc.)
Having element composition (by both raw amount AND percentage) matter for more than just damage would potentially make meaningful decisions exist for producing towers.