Germany lacks employment-at-will; it appears that disputed terminations can easily become lawsuits there (but German law also seems to have orderly mechanisms for resolving these disputes, which boil down to mandatory severance).
German law has what appears to be a strict policy on hours worked per week and per day, and on working over weekends.
German law has statutory maternity leave (which I think is unproblematic) but also a statutory 3-year(!) parental leave, during which time employees aren't paid but are entitled to their job on return. Are startups exempt from this?