Hey! You made ImpactJS? That's very cool, but it's really hard to commit $99 to buy an engine when I can't even try it! It looks super-rad and I'd love to give it a shot, but it's a bit high of a bar for a casual game dev.
If you buy it and don't like it for whatever reason, I can give you a full refund within the first month. That's easier for me to handle than a separate trial license.