Relatively new here and just played my first few games of Perudo here (played the real game extensively).
The implementation for bidding is imo wrong or at the least bad.
To increase the bid you should be able to :
1. Increase the NUMBER whilst leaving
the VALUE the same (i.e. 2x5's becomes 3x5's, 4x5's etc)
2. Increase the NUMBER whilst changing
the VALUE (i.e. 2 x 5's becomes 3x4's or 3x2's or 3x6's etc)
The golden rule being that you MUST increase either the NUMBER or the VALUE or both
The implementation here only allows Number 1 above and in respect of Number 2 it forces you to use a higher VALUE.
This pretty much destroys the game.
It means at any time anyone can just make a bid of 6's (even just 1x6) and at that point no-one can go backward so no other denominations can be used except Aces regardless of what anyone holds. It makes the game totally flat to the point of absurdity.
You SHOULD be able to bid 4x3's after a bid of 3x5's
Without this fundamental rule the game is pointless.