A played a few minutes, here are my thoughts:
- Starting menu, UI and graphics is nice in style and presentation, well done.
- The tutorial explains mechanics clear enough, I did not have any trouble with understanding.
- Since this is obviously 'Plants vs Zombies' with a twist, I will make a few comparisons.
- The 'need energy always' trick is interesting and original in principle, but see below.
- The gameplay is *very* stressful compared to PvZ, the need for constant switching makes the game much harder and requires vigilant attention to hard-to-see details (i.e. which exact lanes need switching on/off. For me personally, this effect made me tired at level 3(!) especially since the difficulty seems to ramp relatively quickly.
- I would suggest altering the UI to make it *much* easier to see what is going on
- highlight on/off state of robots much more prominently, something like full recolor to red/grey.
- highlight the lane under cursor
- highlight the 'wrong state' robots, i.e. turned on then there are no enemies and turned off then there are.
- indicate drain vs income of energy very clearly (something like green/red parallel bars), so player can see at a glance how many panels he needs and how many robots he may afford
- reduce the number of lanes in starting stages, use it as part of a difficulty ramp
- add 'active pause', at least as a global 'easy mode' option
- recolor part of the timebar instead of using just an arrow to indicate current time
- I understand that this is probably just 'not done yet', but make it possible to continue game from the point I left, not from the beginning.
Good luck with your project!