Amazing game! I'm always hyped for little projects like these.
1. Yes, I'm pretty sure it is a thumbnail art.
2. Minor Nitpick, but Selvata seems to think your contributions from a certain point "seems little in comparison to 'all this' ". She says this, even if the amount I've given is magnitudes more than she was given before.
3. If you ever wanted more help with Sprite design, I would gladly contribute if you're okay with it. Otherwise, all good.
Hope you had a great New Year!