With the slots, maybe make it more interesting with bonus rounds or multiple lines. Right now it feels like you have a low chance of winning big, and with multiple lines it feels so much better to play with in my opinion. The plinko/stack 5 is great, however I think you should at least offer a few more choices for the gambler than only the 10/2/1/0/0/1/2/10 choice. Or even perhaps let the gambler choose their own combination, like Bitvest.
Thanks for the feedback on
https://wajur.com/stack5. We are definitely considering a variant of it. And one more thing about Stack 5, there is a betting strategy to this game, if you haven't discovered it. When a coin falls into a slot, it starts to build a stack. Once 5 coins have stacked in the same slot, the payout for said slot doubles for the next coin landing. This means that you can build a plinko grid that cannot lose on the next round, at which point you should consider a different betting strategy.