My experience with challenges so far:
- Chopping trees: careful positioning and chopping quickly seem to do the job fairly well.
- Cutting grass: almost the same as trees, but uneven grass distribution and higher number required make your positioning more important and require more planning so you cut as much as possible during a stop and don't waste too much time running to the next spot. Still doable.
- Killing archers: heavily depends on how the archers will act - whether they are aggressive or defensive and their aim seems quite random. They rather effectively waste my time by running away, while getting enough numbers to eventually make approaching them too dangerous. Managed to beat this one only once - the RNG gods must've been smiling at me that time

- Breaking rocks: It may be beatable, but I haven't managed it. Since white rocks rocks take way too much time, it seems to rely entirely on getting enough brown rocks in a row, otherwise you waste too much time running to the next one.
- Growing crops: Maybe I'm missing some trick here, but I just can't get even close completing this one - delayed reaction from plants make it harder to figure out how many times you have to water them before moving on - I think I figured it out and then it turns out that the previous plant didn't finish, which makes me backtrack wasting precious time. So far it feels like it requires too many plants in too little time.
Did anyone beat the rocks and plants challenges? Is there some trick to mining/watering faster? I just started playing yesterday, so I guess I'll go read the main feedback thread, maybe there's something interesting there.
The way gifts appear in the library doesn't seem quite right.
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I can click "Prize 0" to get the code, but after that I can still use the "Send Gift!" button to send a gift link with that key.
Also I'm not really a fan of blind approach to these gifts, I'd much rather be able to see which game I got without activating the code. But seeing that's how indiegala did those giveaways before, so I guess you have your reasons.
I won Ballpoint Universe, which I vaguely remember being interested in, and Explodemon, which looks interesting. I also won a used key for Dynamite Jack, and I already have AX:EL in my library and even though it's free maybe someone has use for the key:
AX:EL - HaVLN-sMGTC-Ee2GT (a,s,e - numbers that look kind of like corresponding uppercase letters)