To be honest, I found myself rather frustrated by how slow you shoot, enemies seem to shoot 10x faster. Due to that limitation, I felt the difficulty was high enough at least, yet still the game felt a bit lacking to me personally. I didn't time it, but it felt like the reload time was 5 seconds or something ridiculous, in the meanwhile all you can do is hide which I find kind of boring.
Also, the text box on the bottom took up a lot of the screen making fighting enemies in that direction troublesome. Maybe having it appear for new messages and then fade after a few seconds would be better for gameplay.
That all said, I'm sorry if it seems that I'm bashing your game. It's just my opinion and maybe the majority of people will feel differently. The important thing is that you guys got a game completed and more experience under your belt. That's a victory for sure.
Feel free to check out my game and offer your honest opinion. https://ldjam.com/events/ludum-dare/38/rc-kitchen-throwdown