I like the concept! Scored 23 on my first play thru and 32 on my second.
For me the overall gameplay felt a little slow to really feel exciting . Also the bomb weapon powerup didn't seem that great of an upgrade and I seemed to die faster if I tried to use it (unless I'm using it wrong?). Nice that the laser can shoot through multiple enemies. I like the sound effect you chose for the laser by the way! Thanks for automatically giving the powerup instead of making me pop open a menu.
One thing that wasn't immediately clear is since the bullet autofires, I thought the laser would autofire too. Then I was sitting there thinking "Wow this laser has a really long recharge time".... until I realized I had to click the laser button each time I wanted to fire it. Same for the bomb. I'm not sure how that could be addressed, maybe a change in the UI or automatically having the attack default back to bullet after clicking to fire a laser or bomb?
Another weird thing I noticed is it seems if I park in a lane I also just hold back whatever enemies are there (at one point I was holding back 3 enemies with my tank while using laser).
I like the choice of having slow and fast tanks, it makes for some tricky split second decisions of which one you should focus down first.
Thinking back on it, the main thing I'd like to see is just faster gameplay! I feel like (for me) if you increased the player movement speed, enemy movement speed, and fire speed by 25-50%, it would all feel a lot more exciting. Impressive work for only 24 hrs