Play n go is the one for me if playing smaller stakes trying to build, as mentioned book of dead try get a few bonuses – even on low stakes a premium can obviously pay a lot on the bonus and tbh any symbol can help build a balance if you get a hit. Reactoonz play for a garga will usually be decent and can go mental if you get 15 of a top premium. Moon princess/rise of olympus decent fun and if you get a couple retriggers on love/hades it can go 200x+ quite easily.
Imperial opera another one bonuses quite easily and can go for decent amounts and the base is usually good, house of doom worth a go on a bit higher stakes when you got a balance bonuses very easily and loves a 75~100x.
Good luck!