P.S. Katakana is ok. Also, in general rules, daikuten don’t matter – that is, if I end with ぱ, you can start with は, or vice versa. Glides are similar – if I end with しゃ, you can start with either しゃ or や.
Oh, you’ll see it again. =) Also, there are house rules for advanced play – dakuten count, for example. Or a minimum length for words. Et cetera. Those are the “standard” rules, though – inasmuch as this sort of game has standard rules. =)