Hexapro will probably be not as unbeatable as it looks like, and I understand that Unibet had to keep the game 3-max because it has much less liquidity than Stars (even in such a niche game as Spin & Go Max), 888 and Party, which was a severe limitation for the design of the game, but if I were responsible for Hexapro, assuming that the rake is non-negotiable
, I'd make the game a bit slower to allow a bit more room for skilled play in a couple of ways:
1) increase the blind level timings from 3 to 4 minutes in 5x-10x multiplier games;
2) lower the antes from 4 to 2 chips at blind level 2 (15/30) for a smoother transition from 10/20 to 20/40 (ante 5) in terms of effective stack depths.
In general, though, I guess Hexapro has been designed to address the same issue of classical Spin & Gos that 888 and Stars have tried to fix with Blast and Spin & Go Max, namely, the high frequency and long duration of lowest multiplier games, making those negative experiences more memorable than the positive experiences of high multipliers. Thus I consider Hexapro decently thought out given the constraints (the industry-standard high rake being one).
These are just my 2 cents as an observer. Good luck!