This was a cool picross game! I love the characters and I was delighted to discover the secret one behind the truck.
My friendly suggestions for improvements if ever wanted would be:
- An ending sequence with all characters in the spaceship or a planet would be fantastic!
- The powerups get a bit repetitive; all of them are either extra hearts, or revealing tiles. I think many quality-of-life features of modern picross games could be made into powerups for more diversity. For example, marking each individual number as completed as you work on a line, a brush with temporary markers for planning, or an invincible mode that doesn’t punish you for mistakes (at the cost of not informing you whether the marked tile is correct or not either, until you solve the entire puzzle).