It could really use a tutorial or better a campaign, because I think it has a lot of cool stuff I missed. The sound is a bit harsh on the ears IMHO and I wish the old man could move faster. Other than that it's a great game!
Thanks for the feedback! We’ll clarify plant/bug info in the game begining (the Codex Viridis page has it, but it’s not very direct), polish the audio, and tune level-based speed upgrades. We are glad you like the game !