Tears of joy, or regret?

It could go either way depending on how you feel about their art style.
When Elma is being stared down by Gowan at the end of Ep2/beginning of Ep3, I think they intended for Elma to be intimidated, but to me it looks like he's desperately trying not to laugh in Gowan's face because of his ridiculous behavior.
Also, end of Ep3/Beginning of Ep4... they gave the Mad Head wiggly teeth. If the teeth also hooked inwards so you couldn't escape being slowly pulled in and eaten once it bites you then it'd be a lot scarier... but they made the wiggly teeth face outwards... There's not really any point in them being wiggly if they're facing outwards. (I guess it looks scary to children tho?)
I'm still enjoying the anime... even if there's occasionally some parts I feel would have been better if done differently.