I bought Liberation Maiden on Thursday, and I don't regret my decision, even if I'm not too into games whose longevity is based on going for high scores. It has great polish for an eShop title, especially at $5. I didn't like it at first, partly due to its mechanics, but I'm enjoying it more the more I play it and understand how everything works.
It's basically just four stages that last around 5-10 minutes, and a final boss, so the content is really quite light. It's too bad this wasn't a full-blown game that had more depth and content, but I find it fun. I'd recommend it at the discounted price. --- "Why do we feel these rainbows are so fairytale-like? Have you ever thought about that?"
I think I'll get both but are $10 eShop cards sold anywhere or do they only start at $20?
On the eshop, when you go to buy a game, if you don't have enough funds in your account, there is an option to add just what you need. So you would have to do two separate purchases, but it would be exact.