Very beginner friendly incremental that is pretty cute until the lategame. Buy research, upgrade your housing and transportation and unlock more expensive eggs before resetting on everything to get permanent reset layers.
Reaching the lategame after maybe 2-3 months changes your gameplay loop significantly, now only really being dependent on artifact (missions) and community contracts where you have to produce certain amounts of eggs together with others to get rewards.
Premium currency is required to buy some permanent upgrades as well as boosts, which is what higher tier contracts are about. This premium currency is something you get more of than you need by completing contracts and daily logins. Early game the premium currency is rare though and buying the "piggy bank" once for 5$ or sth will boost your significantly.
Late game does become pretty stale either way though as contracts are very repetitive and the later artifact missions take many months to max out.