So far I have enjoyed the Character Creator, and overall I feel it is a very good implementation of a 5E character creation experience. However, there is one issue I have found and that is when a Tooltip explaining an ability refers to another ability of spell that you as the player have no way of referencing without either knowing it off the top of your head or having to leave the game and search through the D&D 5E PHB to find the reference.
A good example happens when playing as a Warlock and selecting your Level 2 Eldritch Invocations. There are many invocations that simply have a description like "This invocation grants "X" spell which can be cast at will"... but you have no way of knowing in the Invocation Selection menu just what it is the spell in question actually does.
I hope that in the future, the devs would be so kind as to add either a description of the spell in the tooltip for the invocation (or other similar feat/ability that grants spells), or a link in the tooltip that provides further information on the spell the invocation grants.
Additionally, it would also be nice to be told within the character creator what other spells or abilities are unlocked as certain Races level up, like the Githyanki and Drow.