Turmoil is charming. It's simple enough to be casual while still strategic enough to be rewarding.

Too much oil, not enough Tumoil.

for me it's very repetitive, all you will do is just digging for oil and sell it in the high price ink, the upgrades are not good either and kinda expensive and I didn't get benefits of some of them, it's not bad but for me not worth spending a lot of time in it.