I just gave this a shot,
Firstly I think you have an interesting and original concept, that's a good start.
I had no problem with the controls, it was fairly straightforward.
At this stage it has the feel of a tech demo, rather than what I would call a game. So I guess what I feel is lacking is the game itself. There's really not much to do, and the three controls (movement, rain and thunder) don't provide enough depth to really give any interesting strategy to the game.
I'd say there would have to be a few more elements added to make this into a game. My suggestions:
- Sunshine. The screen could lighten and darken, affecting plant growth.
- Different bug types. Perhaps some bugs encourage plant growth while others eat the plants.
- Move up/down for altitude, where the higher you are the greater an area the rain sprays over, but with lower growth, and lower altitude means a smaller area but higher growth as a result.
- Maybe even some procedurally generated birds or other wildlife that can benefit/harm in various ways. You may not want to scare the birds off with your thunder.
Basically, I want more! More things to do, more elements, more ideas.
Other general modifications I would suggest:
- Improve the look of the rain and get it to fall much more naturally. You are creating a game that wants a very organic feel to it and the drops look like pellets that fall jerkily.
- I don't think the plant growth should collide with the clouds, since they are tiny and bugs can eat them. Give the screen some more vertical space. Just making a regular resolution would solve this I reckon, instead of the very unusually flat resolution you've chosen.
- The bug eating noise is the sound of a buzzing fly - flies don't eat plants. Picky I know but perhaps choose a mini-chomping sound or something.
That's pretty much all I can think of at this stage. Hope that comes off as constructive, it is certainly intended to be.