I'm pretty sure you normally play the level with 3 characters and a boss fight, you can just replay it with only 1 character and the bossfight turned off
Penny is probably the best character in the game, the only thing that holds her back are the difficulty in controlling her, other than that her extremely fast fire rate and ability to cheat some minigames give her the highest skill ceiling by far
A lot of these I'm watching and thinking oh my god is that how you're supposed to do those? Hopefully I can improve my Penny game cause I really like her but I feel like I'm throwing in co-op a lot when I pick her.
What's the explantion behind the micro games appearing with this stage ? Is this like she is playing video games to past time until getting at her destination ?
Sigh... we need more science/bookworm moe. :( The only ones I know for the most part are some old school 90's/00's classics, like Momo from Breath of Fire III, Yomiko Readman from Read or Die, and Yuki Nagato from Haruhi Suzumiya. :p And none of them are quite as young as Penny though. XD (Oh yeah, I guess the Profressor from Nichijou is technically an extra young loli example, but meh. :p) We need more Pennies. XD